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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3947f578712657a5f98d993a13c561392d39e7f6b35315f7927786b4ac16b12' 
  AND token = 'mlEaWxR7QhrTa/oKAp9t9YRuwOD7QmSIARzCEqe+dRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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