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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e773b205dd518862f8a38c9bae90d7f29a3aea4dc3745b32fd79ae5327584d93' 
  AND token = 'ZwuX5IG7JXuluA4RDM5krXB80jqKOF6rxrc5yPTjHOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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