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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea9abac0b2ad5ca5cef6e66916dd123be031a023fc2b06c5ea6e8a9549bf1a04' 
  AND token = '6BZsYrOWa76+/pbDe7ivfRTLBEL0stP6pwyj1Ve1sEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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