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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c82e3c36f02bbb30e6846f4dcf178e4b0e8cc436b438ba611a0331cab4b4cb8' 
  AND token = 'hHzM3tyapLZqKSQP+lfKETLSlW7rxfEYZDvi6AJWPMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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