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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3580d3395b4b8a4018d44d872e36d9226c3e5ec839aba265000a77f608ee08c' 
  AND token = 'zDxAV8mWQ0YE1nOXae/5pcp5XA+0VwmxwpUe98n82ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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