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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16cfcddc5eddf24f103a1c61c83226e0c1e7637f5e1fe3f2b391bd30e0b3b90e' 
  AND token = 'p6PvZNnmuJRV26P0LlqOJvBfHx7i89HTAjP1T/XhkdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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