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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904a9fbd748abcf861d5805ebe323a5edaf8264425bc1f4be3322eecec97d7dc' 
  AND token = 'lczCi2/xHLFS5og0gC8IccZ35ray2jcw4yb+2X344/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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