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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ed182d4d8f551bfa9bd179fe17881a89667689ee20b489f4f1095ff91ebf548' 
  AND token = 'O7jeL1/RfFqJS8PateogON1BDe8L/nfunPNt/TgQg5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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