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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8175e0269795ba9f3d87296e7dca229adcd83409e5a9d49352c8680d0e0fb9c' 
  AND token = 'M6GVNf2SVh8ec3DJZvIQ4pPtmofcY0MEExVg6nniZfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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