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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '190b7285d266fa19489fc0bf1c971ebd37d3390ec0b4e2ff1b7849464c92b4c8' 
  AND token = 'pJcYXC1XfoWa14tg8ON9iRcikT8TTvsIHtNCeK5EGg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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