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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd46d4ed42bd84cee7ffb93af647c36894d82f7b9b86c7c731b6a280a09608485' 
  AND token = 'DdKg53QuvS2q3zlrapkmYrH/ALFqqh8p0bHIgIaXprU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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