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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85804306b83acb8b61a8b62385234a8f7c447a0b5692c2a8fd63f1ddffae0cf5' 
  AND token = 'vCQB5kn2/gMa5MtPc0jjgKEO2jqEZ2xhS0+pobXkhl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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