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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37cdac7a89290153e2897df77f97142be0ff7a0045953c4def5fd139ee7eb5b3' 
  AND token = 'RDlAPtrJGE5/hReIBR1HcW/sOqLpdXXnirbUfhg/8as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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