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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba18bb086ad9ba077c85c9feb2c5ebee4a3ca6c2930c740217cf4816e025aa4' 
  AND token = 'Q5Pkd3VNcPqvxwS80pp8eu7+Q01UTvKMsoOyNARk0dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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