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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6077e054c9589cb5591ca97c82788e74084cd7889a34b30e456e4714e0ceb4b2' 
  AND token = 'uJVUuWUpFNaw7gG35rAMcb3Ze/M80ygzf7msl6AmXGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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