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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aebb5b0c5d54f9ea7549e598c005fb0ae9869af4622c0e11ae2cdcbe9fa8f014' 
  AND token = 'IimLp91DSTJKjdNF9DTPXacoVb8yKMeFw3KqG+46hYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}