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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf8bdccff142666d3ce1b47ded63170a7aa65defdd8367d0ae77bad5da10744f' 
  AND token = 'frR08AVnb/3BsVbtmQQOv98Aau8/0oT6KjyNcWIHnLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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