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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e31c59dd30b54239ec136eefce2d6e9ce242bc1dd6a4126e0c5b6c9dd85549a' 
  AND token = 'rrhMO8Cqlch2hesAjyRcijmJvYyRZSV9nCnmw36pXO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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