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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6e9a4413513058c8fc867b7ec3d10b4cf3cbac697a1f9667e6ca5659c851851' 
  AND token = '99ZStEAcEh07+f9t9PUlFrGE259S4amubkA1GoYu92A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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