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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9bc3f51a872c4d500e709b313d0126700d7899162611c056f7c19cc98fc7df5' 
  AND token = 'kcevd3R4oh+lDv+RHSWZS6bvbSA1vkCvhz3WBkBv/p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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