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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07ce180e28b0844d1d712c88090e7c00e2f745475d09540c4be8af69e98c27b' 
  AND token = 'e4mXTKcP9BQ9CTihSsD5545g7c4BhdR0E3HEm9kp/+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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