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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26888799b68c40d6c020df6fa4ba3f70464a40b1ebff580021068f1af47d0f14' 
  AND token = 'aPbBOh0z1ya8xq2vNjdxszw+0KG8WK0VUTGUEWcVMlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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