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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b60eec12577f5dc058501e7e1d4db43f9ef3a5f0bce6c5a58678a50169492a' 
  AND token = 'AWm02JHTnc1feIhnJiqzF9M6pEqnJVDXk8f/qrNV19w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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