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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7fd0afc14a14f858e10d3d4505071b14f4cfdd7d4c6977c01ea2a98295a5db8' 
  AND token = 'lheeQ9Lj+zMJ0Qq/dw5OqrgIBkr0Dr3A+1KU5ESvix0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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