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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913aeb222d88f1630a2e9a616dade85757a1c3804266b2be5020e93c04c5932a' 
  AND token = '+VgUz9OpcsuBGDxH9cAJayyvnuDmwNCd6C3TlOej6n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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