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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e5ee290f123f02d4d06fb648cc8713012dcbf66e0d439f18be62c4105e48d3' 
  AND token = 'yrE9WZ5IvvtstLcn+dhXC0oxLks0WlM63TOz9rhNTI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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