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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e43ef137e2af91b352ad57f13566d6c6ad11cbfc469c03666a5b0ac03c5232b' 
  AND token = '2Nbp7FcOAaV3HtK/pk87WAb/ETSUUxGbScxY+sxAf1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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