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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa59ff19106498c678d0d1c09f3c418f0bc98bf7b3881c2249fec4b93d530bb0' 
  AND token = 'BL9H8U4egNY2UFxL7hUpMbSZewc/0zT1FykX9zS7qrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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