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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '897c8153eefcb711689462d7d333abcf3f115c502857507e8e7a2f3bbd8d4c66' 
  AND token = 'cwyuVSqRIFJbpnxrRdA2f6KPHjvkcSSVuneucTnQSGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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