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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093e14d2914bfe724e829e1fe7b23e7128f4ce73365c44b347a9ad4f89b78ec2' 
  AND token = 'rlmmnZMfbGAGiGo+CQJQtJ48LqMj93eG2DlugssMgfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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