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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617271bd7b64538753fb3e154fe7cf3b4c6a67c40ecef28b1c9cb66b78ace845' 
  AND token = 'WSOmut2FzAwFvMXkrI4rb/+a0u1DpQEJfd2rnsbLdvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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