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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5956fa14372b59e221f7ea23b797f81b117f07616d5cbb39f1f5d2b9603d0d0b' 
  AND token = 'jh9HS7hwqAObzDZ7Dy6FEXvUe/bNhdZE5MGcqMtwPOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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