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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c3baa82f7767fe0827a9b2caf258a74a58f560230cebc67aecf991b43640316' 
  AND token = 'kNI94LiQb9V7XebWLdlLN2wMHs+r132iPpx4byNLUoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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