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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8870bd8b42e10e805e5091408ff1d1211876982641d0860f5b835d1eb239cd' 
  AND token = 'Ssi9Z3/0Xhk9tJwyV+ZrR7RCfqAIGinPWshKOGSUn8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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