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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c87d8d90fed203f2049f150ff46a43ff15403f8b2858ca1f2718cb021e58b5' 
  AND token = '5Crc4gl0LFVlAmdg3eVG/wHJ42YW2/I32LcQy2qzL8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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