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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f1b87b9944fcbd139c83b2984831d1b3bdae163606059e33d7ea108c8666aa' 
  AND token = 'hqhWJ431JJ6fPBQEfD50MpiTM1YVoSYWctTyEEMBe78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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