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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98f8fcbffe830c2d3b7a02bdd4d975023f7f5824ab326c812321d03c7fb1e2e' 
  AND token = 'vOegoeIMulZIj+lMt8HEu7SN3YxfuM9ZEi0xtNXUJkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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