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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea53cd31833631d6f9d54579ccafa674b91ae3f4ce352116d3b36014d30e1dc2' 
  AND token = 'yeH59uUe3a5YqGruqVWi5OexiJ2olJE01+C2M62cb9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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