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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e048aa042089c69cd6d9792725ea8951be5308d3ba0696b8983eb2f7e14a1a' 
  AND token = 'Qy01kMFM4+y8/oxiyXlyyy5dZ1X0Fn7VlqGlkVffGvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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