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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '927715e95734aedd2bf7b34c2c49589a816f32c294cee6d4b2aff21ba6162bc3' 
  AND token = '2FCqJxH4LDqQ2g5xpHrYNYel/j+bAj17ak2H8nwH7mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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