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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b51714624d51d6e81e86e48441165735e7f1344d711b3c1fbb68ca64c4802ec' 
  AND token = 'iK6NxFSoSZ691OxTK49kyrh4L/SkFhRGwi6iVuGfvpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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