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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '615f902156a8d758f966c07b1dfc07ff4f635f850e2cc5d23867c1a4ef698b30' 
  AND token = '0VpERNWo3aAIw+8uHMC5DHBUkX9nBcGw8X0fKD9amMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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