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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '560906145860ee0037dac2662378a8491def23eb2867ab18164a0843b37fc249' 
  AND token = 'n9D0Vfd4n/rEn1+xs93yMcTyQK3A5RdXXS6GwU4FQso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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