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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1910f9b57d475a2b63fe186d7e9af88414f21c8940e7b3685482e4521218c308' 
  AND token = 'D+cWPNlv0kXZPMwaBZSwmu/84z5Gj5wEM18R1PwpH/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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