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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13aae921da179a0aebf5201222de05ca907f0e50f49402447fbf21c8d55dc4c' 
  AND token = '6MUcvMvab1TXmiJuRRyejvTPaiLD/I7jS9AH0GicVj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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