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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2ba3fc77f2688ccd848412398206f9a76c3e8d7c0a48381c0002f938a48ac7b' 
  AND token = 'I0eJdFpYctoi20FtVR/UMRK+GA7ObwVSAwFdUA9/gsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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