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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df9dc45a8165aee3581e849977c365e1578591830f28d650bea919c933eeb7d' 
  AND token = '7Dtob2QZPU/9n6NnTlKx14EbmbedWVZtd6/Ng9mUmCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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