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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e2c10d3fff210263aec128702bd29bc98ca138b93a5a041c635e9d139a40c2a' 
  AND token = 'nOYLj6WDeyvhTBz5r+FE8xvmwjxJQR+t1UqvmO97cRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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