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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '830c0333aea6eed002ba5527387047a6da34f7762cd5bd7874047a798fb383b5' 
  AND token = '30abHDUFu2wbtZtnIR3JjEDnNGyT70CBbDZhEEy1Oic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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