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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b372e4759d3dbe7a5a65a6f1ef88172e5c261d89538bbed657afc8e9866a0d72' 
  AND token = 'laRbnQeShzYAR7L/Dc4Bgta8imwhkGRWqeIbr5G1+30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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