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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d82b93c372547d6876c4e5fa05c8ef660abd06e54864abee98545f22e7b9a5a' 
  AND token = 'BXq4j+WaZWBPfRkEGi6aznsXhclkI5q6U+jvCdTroLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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