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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e3d51fbfec7e345779bd3d0d9513d4f9d48baf9d99c4c0722e3a5a0d3828624' 
  AND token = 'IuqRMFJqJvViSUurhEaW3t7zHF67Sqc/VdjzAkElvs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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