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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97fd68ceaed5878e79d89a44b215215ab012ce0c4b5a38c5ae6a665ba358c80e' 
  AND token = 'tmd3vPSebgZZlk/kVuICLJd6Tvrb+lzerHPZAzaaZI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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