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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '011e45be6a0ee5c6f238c3323f2d289d6d21db14eed6be6c6ca16ced219a5e96' 
  AND token = 'epTQb203mnDN9qVNRYWd0sKMqLrGX+k21paf3DqBXsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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