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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eea991d4ab1fc39733f935b2e93f5ab076cbb5afc2e97818793bceb77fd2859' 
  AND token = 'BUer9EovNswAlKKWuI2EnN84dyjX26za35myE+8T0Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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