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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9acdea82f610eeb325cbcec6315c1ba162f631bade00570523688ca3a962ad6' 
  AND token = 'qm1FchHmEzoP1X5DBJkNSRoZKzReY9a00J3IBseX+9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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